High quality, aluminium alloy seat-post clamp to suit a 31.8 mm seat-tube. Aluminium alloy construction for strength and durability with a hex / allen key bolt for extra security. Smooth, black finish for minimal style to suit any bike. This is a high quality, aluminium alloy seat-post clamp, designed for a 31.8 mm seat tube. This measurement is the external diameter of the seat-tube, which is the part of the bike frame that the seat-post slides in to. This kind of seat tube is typically found on aluminium road and mountain bikes with a 27.2 mm seat-post. The use of a hex / allen key bolt for tightening the seat-post clamp, instead of a quick-release clamp, makes the seat-post more secure and less likely to be pinched or tampered with.

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